218051138761 has 2 divisors, whose sum is σ = 218051138762. Its totient is φ = 218051138760.

The previous prime is 218051138759. The next prime is 218051138771. The reversal of 218051138761 is 167831150812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193002062400 + 25049076361 = 439320^2 + 158269^2 .

It is a cyclic number.

It is not a de Polignac number, because 218051138761 - 2¹ = 218051138759 is a prime.

It is a super-2 number, since 2×218051138761² (a number of 23 digits) contains 22 as substring.

Together with 218051138759, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (218051138771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109025569380 + 109025569381.

It is an arithmetic number, because the mean of its divisors is an integer number (109025569381).

Almost surely, 2^218051138761 is an apocalyptic number.

It is an amenable number.

218051138761 is a deficient number, since it is larger than the sum of its proper divisors (1).

218051138761 is an equidigital number, since it uses as much as digits as its factorization.

218051138761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 43.

The spelling of 218051138761 in words is "two hundred eighteen billion, fifty-one million, one hundred thirty-eight thousand, seven hundred sixty-one".